This is a one-slide powerpoint, that illustrates step-by-step how to solve an equation with a variable on both sides of the equal sign. It demonstrated solving the equation two different ways -- eliminating the variable from the left and then right
While this isn't an original problem, the animation is original. The animation isn't professional quality, but good enough for students to "see" the problem.
A dog is tied to a stake in the center of a yard with a 30 foot leash. The yard is a